Device and method for directly detecting non-methane hydrocarbon content

A technology of non-methane total hydrocarbons and content, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of detection value error superposition, etc., to prolong the life of the chromatographic column, shorten the sampling time and backflushing time, and reduce the total test time Effect

Inactive Publication Date: 2019-03-29
浙江全世科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a device for direct detection of non-methane total hydrocarbon content, which realizes direct detection of non-methane total hydrocarbons under the condition of one-time sample injection, and solves the problem that when the backg...

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  • Device and method for directly detecting non-methane hydrocarbon content
  • Device and method for directly detecting non-methane hydrocarbon content
  • Device and method for directly detecting non-methane hydrocarbon content

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specific Embodiment 1

[0050] Specific embodiment 1 provides the detection device and the method that patent of the present invention is used for testing non-methane total hydrocarbon content, and combines figure 1 and figure 2 The first specific structural implementation based on the patent of the present invention is given.

[0051] A non-methane total hydrocarbon content direct detection device involved in the patent of the present invention includes: a sample gas channel, two carrier gas channels, a quantitative loop 6, a chromatographic column 5, a multi-way sampling valve 15, a first gas storage tube 3, the second gas storage pipe 4 and a detector 8.

[0052] The multi-port sampling valve 15 can be switched under two working states of load and sampling. Such as figure 1 As shown, in the load state A, the sample gas port 1 can be sequentially connected to the first gas storage pipe 3, the second gas storage pipe 4, the chromatographic column 5 and the quantitative loop 6; figure 2 As show...

specific Embodiment 2

[0069] Specific embodiment 2 combines image 3 and Figure 4 Provide another structural realization of the patent of the present invention;

[0070] exist image 3 and Figure 4Among them, the non-methane total hydrocarbon detection equipment includes a sample gas 1, a first electromagnetic three-way valve 2, a first gas storage pipe 3, a second gas storage pipe 4, a chromatographic column 5, a quantitative loop 6, an exhaust port 7, a detector 8, First carrier gas 9, second carrier gas 10, first electronic pressure controller 11, second electronic pressure controller 12, second electromagnetic three-way valve 13, sampling pump 14 and multi-way sampling valve 15;

[0071] The multi-port sampling valve 15 is a ten-port valve. The sample gas port 1 is sequentially connected with the sampling pump 14, the second electromagnetic three-way valve 13, the first electromagnetic three-way valve 2, the first gas storage pipe 3, and the interface A2 of the multi-way sampling valve 15...

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Abstract

The invention discloses a device for directly detecting non-methane hydrocarbon content. The device comprises a sample gas channel, two gas carrying channels, a sample loop, a chromatographic column,a multi-pass sample inlet valve, two gas storage pipes and a detector. In a load state, after sample gas is successively filled in the two gas storage pipes, non-methane hydrocarbon in the sample gasis eliminated through the chromatographic column for filling the sample loop, thereby finishing a quantitative sampling process. In this state, first carrying gas successively enters a first gas storage pipe, the sample loop and a second gas storage pipe and then enters the detector, thereby obtaining a non-methane hydrocarbon chromatographic peak with background gas as a baseline, and finishing direct detection for the non-methane hydrocarbon content. Second carrying gas performs backflush cleaning on the chromatographic column. The device and the method can realize direct detection for the non-methane hydrocarbon content in a one-time sample entering condition, and settles a problem of detected value error superposing caused by a subtraction method when the background concentration of the non-methane hydrocarbon in the sample is far lower than the methane concentration. Furthermore the device and the method have advantages of high detection result accuracy, reliable and stable method, etc.

Description

technical field [0001] The invention belongs to the technical field of technical gas detection, in particular to a device and method for direct detection of non-methane total hydrocarbon content. Background technique [0002] The concentration of methane and non-methane total hydrocarbons in the atmosphere is about 1.8ppmv and 30ppbv. Non-methane total hydrocarbons refer to all volatile hydrocarbons (mainly C2-C8) except methane. When the non-methane total hydrocarbons in the atmosphere exceed a certain concentration, in addition to being directly harmful to human health, photochemical smog can also be produced by sunlight under certain conditions, which is harmful to the environment and human beings. Therefore, it is very necessary to monitor and control non-methane total hydrocarbons in areas such as ambient air and factory boundaries. Among them, the factory boundary concentration standard of non-methane total hydrocarbons in my country's "Integrated Emission Standards f...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/68
CPCG01N30/02G01N30/68
Inventor 于丙文黄新宇李涛涛陈挺
Owner 浙江全世科技有限公司
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